Modes of Grain Selection in Spiral Selector during Directional Solidification of Nickel-base Superalloys

Xiangbin Meng 1,2),Qi Lu 1,2),Jinguo Li 1),Tao Jin 1),Xiaofeng Sun 1),Jun Zhang 3),Zhongqiang Chen 4),Yanhui Wang 4) and Zhuangqi Hu 1) 1) Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China 2) Graduate School of Chinese Academy of Sciences,Beijing 100049,China 3) State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi an 710072,China 4) Aviation Industry Corporation of China(AVIC) Shenyang Liming Aero-engine(Group) Corporation LTD.,Shenyang 110043,China

摘 要：The modes of grain selection in spiral selector were investigated by both a ProCAST simulation and experimental confirmation.The results show that the efficiency of grain selection in starter block is associated with the geometry shape.At the early stage of grain selection,the optimization of grain orientation is dominated by competitive grain growth,but the optimization of grain orientation in starter block is gradually dominated by geometry shape at the later stage of grain selection.Besides,the spiral part could also optimize the orientation of the selected single crystal when the initial angle is large enough,and the single crystal selection in spiral parts with different pitch lengths and initial angles is dominated by different modes.The simulation results agree well with experimental ones.

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